Method AssumeRole

test/gtest/gtest-all.cc:7178–7264

The AssumeRole process for a Windows death test. It creates a child process with the same executable as the current process to run the death test. The child process is given the --gtest_filter and --gtest_internal_run_death_test flags such that it knows to run the current death test only.

// --gtest_internal_run_death_test flags such that it knows to run the
// current death test only.
DeathTest::TestRole WindowsDeathTest::AssumeRole() {
  const UnitTestImpl* const impl = GetUnitTestImpl();
  const InternalRunDeathTestFlag* const flag =
      impl->internal_run_death_test_flag();
  const TestInfo* const info = impl->current_test_info();
  const int death_test_index = info->result()->death_test_count();

  if (flag != NULL) {
    // ParseInternalRunDeathTestFlag() has performed all the necessary
    // processing.
    set_write_fd(flag->write_fd());
    return EXECUTE_TEST;
  }

  // WindowsDeathTest uses an anonymous pipe to communicate results of
  // a death test.
  SECURITY_ATTRIBUTES handles_are_inheritable = {
    sizeof(SECURITY_ATTRIBUTES), NULL, TRUE };
  HANDLE read_handle, write_handle;
  GTEST_DEATH_TEST_CHECK_(
      ::CreatePipe(&read_handle, &write_handle, &handles_are_inheritable,
                   0)  // Default buffer size.
      != FALSE);
  set_read_fd(::_open_osfhandle(reinterpret_cast<intptr_t>(read_handle),
                                O_RDONLY));
  write_handle_.Reset(write_handle);
  event_handle_.Reset(::CreateEvent(
      &handles_are_inheritable,
      TRUE,    // The event will automatically reset to non-signaled state.
      FALSE,   // The initial state is non-signalled.
      NULL));  // The even is unnamed.
  GTEST_DEATH_TEST_CHECK_(event_handle_.Get() != NULL);
  const std::string filter_flag =
      std::string("--") + GTEST_FLAG_PREFIX_ + kFilterFlag + "=" +
      info->test_case_name() + "." + info->name();
  const std::string internal_flag =
      std::string("--") + GTEST_FLAG_PREFIX_ + kInternalRunDeathTestFlag +
      "=" + file_ + "|" + StreamableToString(line_) + "|" +
      StreamableToString(death_test_index) + "|" +
      StreamableToString(static_cast<unsigned int>(::GetCurrentProcessId())) +
      // size_t has the same width as pointers on both 32-bit and 64-bit
      // Windows platforms.
      // See http://msdn.microsoft.com/en-us/library/tcxf1dw6.aspx.
      "|" + StreamableToString(reinterpret_cast<size_t>(write_handle)) +
      "|" + StreamableToString(reinterpret_cast<size_t>(event_handle_.Get()));

  char executable_path[_MAX_PATH + 1];  // NOLINT
  GTEST_DEATH_TEST_CHECK_(
      _MAX_PATH + 1 != ::GetModuleFileNameA(NULL,
                                            executable_path,
                                            _MAX_PATH));

  std::string command_line =
      std::string(::GetCommandLineA()) + " " + filter_flag + " \"" +
      internal_flag + "\"";

  DeathTest::set_last_death_test_message("");